After use throughout the winter, the Central Conservatory of Music give us feedback, six V6-99 fully meet the heating needs of the school. And jacketed boiler with mixer fuel and water requirements are not high, urban water and low-pressure natural gas combustion can operate. The most important point is that nitrogen oxide emissions are very low and very happy to recommend it to others to do the brother of boiler units. --customer feedback
This will need to let the steam jacketed boiler with mixer has better strength, not the strength of technology and design of the above, the main boiler hardly be better quality. There is in the manufacturer's production, also requires the use of advanced materials, if a factory is in production did not let the boiler body using high-quality materials, although it can be used, but will make it a great energy-saving and life Decline. Furthermore, the need to let this boiler has a good advantage in the production of accessories, if a manufacturer is no good parts, it is difficult to let the group have a good performance.
As a kind of special equipment in industrial production, jacketed boiler with mixer has a very comprehensive standard and system. The reason is very simple and dangerous, and the consequence is very serious. Strengthen management, guarantee safe production, is the enterprise must do a good job. In order to prevent the recurrence of similar tube burst accidents, combined with many years of operation management, analysis and summary of this tube explosion accident, we realize some enlightenments for the operation and management of boiler reference.
1) the operating procedures shall be strictly followed in the management of operation. The operation procedure of boiler makes clear the concrete procedure of boiler operation, and it is the basic guarantee of boiler safe operation. Operation behavior meets the requirements of the regulations, boiler operation in accordance with its own operation law, can run safely.
2) strengthen the boiler water quality management to ensure that the boiler water meets the water quality requirements. There is a misconception that boiler scaling will not occur if the water quality of the boiler is qualified. After these calculations, although the water hardness of the boiler is ≤ 0.03 mmol / L, the residual hardness still exists here. In the operation of the boiler, the residual hardness will accumulate in the form of scale in the furnace tube. After the explosion of the boiler tube, we tested the boiler water, and the hardness did not exceed the standard. In our day-to-day management, there are special personnel responsible for boiler water quality testing, to do one test per shift, technicians regularly sampling, all meet the requirements. But most The end result was a problem. Therefore, in boiler water quality management, the hardness of boiler water should be reduced as far as possible, the residual hardness should be reduced, and the harm to boiler should be reduced.
3) strengthen the annual maintenance work of boiler. After a hot-water heating boiler runs for a heating cycle, It is necessary to carry out the annual inspection and repair work. The maintenance work is very important to the subsequent operation of the boiler. In addition to ensuring that all parts of the boiler are in good condition and meet the requirements through maintenance, it is also necessary to focus on dredging the boiler tubes and make sure that each tube is unobstructed in order to ensure the smooth circulation and at the same time, This can also remove loose polymer in the tube.
4) in view of the structural characteristics of the boiler itself, corresponding measures should be taken to confirm the boiler's state. The 14MW hot water boiler, due to its own structural characteristics, adopts the partition made of steel plate, and divides the internal flow of the boiler into three series processes. Because the partition plate is welded and sealed, the difficulty of overhaul increases, and the partition board is not regularly cut. The furnace tube was dredged and accumulated, and the scale was thickened year by year. Finally, the furnace tube was completely blocked and the furnace tube burst accident occurred. In view of this particular boiler structure, it is necessary to make the determination to cut the partition regularly, carry on the inspection of furnace tube, dredge and so on maintenance work, make sure Keep in good condition, lay the foundation for safe operation.
5) make annual inspection in accordance with the requirements of boiler supervision regulations. This annual inspection shall be carried out by a qualified unit or agency to verify that the boiler meets the requirements for safe operation and that the inspection report is available. Although the annual inspection of the 14MW hot water boiler has been carried out, however, the annual inspection is, after all, a routine inspection, although the intact condition of the pressurized components of the boiler body, the internal corrosion situation, the water-cooled wall tube, the convection pipe bundle, The walls of the furnace have been thoroughly checked, but the scale is often difficult to judge. In spite of this, such tests can well prevent defective boilers from being put into use. The accident happened.
6) regularly carry out boiler chemical cleaning. This 14MW hot water boiler, which has been in operation for more than 10 years, has not been cleaned for a very simple reason. During the maintenance and inspection of the boiler every year, no scaling was found in the opening of the visible part of the furnace tube (convective tube, water-cooled wall tube). It's very clean, so no chemical cleaning has been taken. It is analyzed that the area where boiler fouling is more serious is usually in the boiler high temperature area, but this part of furnace tube can not be judged by conventional means. At present, although there are advanced speculum, but in the actual operation management, the production unit configuration of such equipment is very few. Then, take regular cleaning The measures can effectively reduce the fouling in boiler tubes and avoid similar accidents.
7)strengthen the protection of high temperature parts of boiler. This 14MW hot water boiler is the detection point of furnace temperature, that is, the highest temperature at the end of the combustion chamber, which is the combination of convective heat transfer at the end of the combustion chamber. At the same time, it is also the beginning of convective heat transfer. Therefore, the radiative heat transfer and convective heat transfer in this part are very strong in boiler operation, and the result of this accident shows this problem. In the process of boiler installation or maintenance, special attention should be paid to this point. High temperature resistant materials can be used for proper heat preservation treatment of this part of the furnace tube, so as to reduce the heating strength of the furnace tube and slow down the scaling rate, which is positive for the prevention of similar accidents. With.
The correct method of operation of steam jacketed boiler with mixers (a) Power: 1. The operator must first have a fireman qualifications, so that the holder operation. The person in charge should carefully read the operating manual of the equipment, knowledge and proficiency in the safe operation method. 2. Before each boot to check the gas valve is open, otherwise the burner does not work. 3. Start button Power Control cabinet control, digital display window displayed at this time the current pressure in the furnace, the pressure level of the boiler with reference to the judgment section control instructions. 4. After starting the burner, the first pre-purge fan 30-50 seconds, and then open the gas valve; i.e. establish a flame. (With reference to the specific burner combustion process instructions) 5. Start and stop by the boiler burner is issued by the controller to start and stop instruction according to pressure changes (this function is automatic) The operator should always observe the change in pressure occurs when the abnormal phenomenon immediately shut down, the cease-fire. You should always observe the water level, in particular to ensure that the tank is full of water 6. fill the boiler operation during operation. The operator shall periodically to the boiler blowdown, boiler water quality assurance. 7. Once the boiler during operation anomalies operators should be shut down immediately after treatment failure re-boot. 8. A burner for a three-phase power supply the operator should be determined before the first start motor forward, reverse, or can not normal ignition. (At this time, the fan stops burner ten seconds after the start, the alarm control box) (ii) shutdown: 1 off two situations: First: When the furnace pressure reaches the set value is automatically shut down, then The operator does not have to do anything. 2. The second is: and artificially stop down shift, then the operator should press the stop key boiler controller, turn off the burner, and then turn off the controller; Once complete stop combustion disconnect the power. 3. To turn off the gas valve when the pipeline for a long time, in order to avoid the risk of leaks.
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